摘要
采用实验研究和数值模拟的方法对除尘装置收集烟尘颗粒的过程进行定量描述,是发展高效可吸入颗粒物（PM）除尘方案的理论基础。对300MW燃煤锅炉静电除尘器（ESP）前后的飞灰颗粒进行在线采样,以研究其尺度分布规律和排放特征,采样系统由高温水冷取样管、旋风分离器和低压撞击器组成。实验结果表明,ESP前后飞灰颗粒呈典型的双峰分布,峰值出现在0.08μm和2-5μm附近。然后以ESP进口实验结果为初始条件,采用事件驱动常体积法对ESP的除尘过程进行颗粒群平衡模拟,能够得到烟尘颗粒尺度谱在ESP纵向长度上演变过程的细节信息,ESP出口颗粒尺度分布的模拟结果与试验结果较为吻合。
The use of an experimental study and a numerical simulation to quantitatively describe the smoke particle collection process in a dust removal device provides a theoretical basis for developing an effective PM (particulate matter) dust removal scheme.The fly ash particles before and after an electrostatic precipitator (ESP) of a 300 MW coal-fired boiler were sampled on-line to investigate their size distribution law and emission characteristics.The sampling system was composed of a high-temperature water-cooled sampling tube,cyclone separator and low-pressure impactor.The test results show that the fly ash particles before and after the ESP assume a typical dual-peak distribution with the peak values emerging at around 0.08 μm and 2～5 μm.Thereafter,with the test results at the inlet of the ESP serving as initial conditions,an event-driven constant volume method was used to carry out a particle cluster equilibrium simulation of the dust removal process in the ESP.The detailed information about the evolution process of the smoke particle size spectrum along the longitudinal length of the ESP can thus be obtained.The simulation results of the particle size distribution at the ESP outlet were in relatively good agreement with the test results.
出处
《热能动力工程》
EI
CAS
CSCD
北大核心
2008年第3期259-264,共6页
Journal of Engineering for Thermal Energy and Power
基金
国家自然科学重点基金资助项目(90410017)
国家重点基础研究专项经费(2006CB200304)
关键词
燃煤锅炉
静电除尘器
可吸入颗粒物
颗粒群平衡模拟
颗粒尺度谱
coal-fired power plant,electrostatic precipitator,inhalable particulate matter,particle cluster equilibrium simulation,particle size spectrum
